clearfix {
  &:after {
    content: "";
    display: table;
    clear: both;
  }
}

triangle($width, $height, $color, $direction) {
  $width = $width/2;
  $color-border-style = $height solid $color;
  $transparent-border-style = $width solid transparent;
  height: 0;
  width: 0;
  if $direction==up {
    border-bottom: $color-border-style;
    border-left: $transparent-border-style;
    border-right: $transparent-border-style;
  }
  else if $direction==right {
    border-left: $color-border-style;
    border-top: $transparent-border-style;
    border-bottom: $transparent-border-style;
  }
  else if $direction==down {
    border-top: $color-border-style;
    border-left: $transparent-border-style;
    border-right: $transparent-border-style;
  }
  else if $direction==left {
    border-right: $color-border-style;
    border-top: $transparent-border-style;
    border-bottom: $transparent-border-style;
  }
}
